Tunnel Ventilation Technology by MRT TEAM

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Ira Hodges
6 years ago
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1 Tunnel Ventilation Technology by MRT TEAM

2 European approach April 2004 Release of ED 2004/54/CE relevant to TEN (Trans Europe Network) road tunnels. Minimum safety requirements. Previously in 2001 European Commision promoted SAVE. Program on energy saving. Results shown in an official Report pubblished in the same year. Relevant to underground systems a possible target of 4 TWh/annum reduction could be achieved. The reduction equates to 1,6 million tons of CO2.

3 Piarc Approach The Permament International Association of Road Congress have always been active in the energy savings in the ventilation systems. Currently the Working Group 1, Technical Committee C 3.3 is working on a document that it will presented during the next World Congress in Seoul, KR, November Sustainable Road Tunnel Operation (Draft 3 April 2014). Main focuses: - Alternative energy sources - Improved or more efficient equipements - Improved or more efficient solutions - Encourage use of electrical inverters

4 Road Tunnels

5 Road Tunnels Ventilation requirements Pollution control for comfort & safety Smoke control in case of fire

6 Pollution Calculation of Fresh Air POLLUTION CONTROL PIARC 2012R05EN

7 Fire Emergency Calculation of required Jet Fans Fire Emergency PIARC B PIARC B

8 Critical Velocity The critical velocity, Vc, is the minimum steady-state velocity of the ventilation air moving toward a fire that is necessary to prevent backlayering Note: Vc m/s for standard calculation 3 m/s is used due to missing parameters in formula

9 Longitudinal Ventilation Jetfans installed the tunnel generate an airflow so that air enters one portal and is discharged at the other portal.

10 Pressure losses Tunnel longitudinal ventilation It works on an induction principle It is based on exchange of momentum (mv) between jetfans and tunnel air Thrust generated by jetfan induces fresh air into tunnel

11 Tunnel Losses Required Thrust Tunnel Losses Piston Effect (+/-) Metereological Effect Other Losses Total Losses xxx Pa xxx Pa xxx Pa xxx Pa xxx Pa Pa = N/m² (Total Losses) x (Tunnel Face Area) = Force N/m² x m² = N Force = Thrust

12 Trust of jetfan Theoretical thrust T f qv V f [N] Real thrust ISO13350 Thrust in the tunnel Tt qv (V f Vt ) [N]

13 Total trust in the tunnel Tt Tf Vt (1 ) Vf [N] Total jetfan thrust in the tunnel with jetfan installed: Tf Tt Vt k (1 ) Vf [N]

14 Tipical Installation Normally JET fans or Booster fans Installation close to the tunnel surface

15 Total trust in the tunnel k = can be as lower as 0.65 Vt Vf influence up to 0.8

16 Mechanical Longitudinal Ventilation Equipment

17 Jetfans BENEFITS FOR USER High efficiency Low noise operation Robust and durable High operating reliability Low maintenance Reliable corrosion protection Reversible Flow EN Certification up to 400 C/2h

18 Jetfans BENEFITS FOR CONTRACTOR Easy to install Wide ancillaries range Global services network Adaptable requirements Technical support

19 Longitudinal System Components Jetfan Performance Testing Thrust Test as per ISO Acoustic Test as per ISO13350

20 Thrust measuring Recorded and converted values of the force transducer The average thrust will be shown as result Sample diagram

21 Sound measurement of Jet fans Sound measurement of jet fans according to DIN EN ISO as an Independent test setup L W L p(m) - L p(r) L W(r)

22 Overview standards used Air performance measurements on our inlet test chambers Small test chamber ISO 5801 (Industrial fans Performance testing using standardized airways) Big test chamber AMCA (Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating) Air performance measurements on our inlet tube test rigs Both tube test rigs AMCA Thrust measurements and sound measurements of jet fans Test rig / sound setup DIN EN ISO (Industrial fans Performance testing of jet fans)

23 MoJet

or both sides of a fan -The upper part of the silencer is inclined

24 MoJet - MoJets combine the advantages of jetfans and Saccardo - The sagomated silencers ( inclined cutted outlet ) are installed on one or both sides of a fan -The upper part of the silencer is inclined towards the tunnel centreline, enhancing the installation efficiency

25 Tunnel Ventilation System components MoJet - Installation factors Installation Factor ~ 0,70 Installation Factor ~ 0,75 Power increases ~ 5% Noise level remarkably increases No power increases

26 MoJet Installation Factor ~ 0,94 No power increases

27 Tunnel Ventilation System components MoJet Advantages - Significantly enhanced thrust - Reduced power requirements - Smaller diameter fans can be selected for the same installed thrust as conventional jet fans - No encroachment of traffic envelope - Can be installed very close to tunnel walls and soffits, reduced space requirements - Reduced cabling costs using - Reduced maintenence costs ( less units ). -Reduced running cost. -Better LCC

28 Thanks for your attention!

Jet Tunnel Fans.

Jet Tunnel Fans. Jet Tunnel Fans www.systemair.de by Division AJ (T) Tunnel Jet Fans Standard features: Thrust efficiency in excess of 40 N/kW Adjustable aluminium impellers for maximum efficiency Terminal box on the casing